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    <meta charset="UTF-8">
    <title>向量的线性表示和组合</title>
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        <canvas id="mycanvas" class="canvasCSS">该浏览器不支持该页面，请换浏览器！</canvas>
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    <div class="divInput">
        <div class="shili">
            示例：<br>
            <b><i>&beta;</i></b>=(1,3)<br>
            <b><i>&alpha;<sub>1</sub></i></b>=(6,5)<br>
            <b><i>&alpha;<sub>2</sub></i></b>=(5,8)
        </div>
        <div class="in"><b><i>&alpha;</i></b><sub>1</sub>=(<input type="text" name="i1"
                placeholder="i1">&nbsp;,&nbsp;<input type="text" name="j1" placeholder="j1">)</div>
        <div class="in"><b><i>&alpha;</i></b><sub>2</sub>=(<input type="text" name="i2"
                placeholder="i2">&nbsp;,&nbsp;<input type="text" name="j2" placeholder="j2">)</div>
        <div class="in"><b><i>&beta;</i></b>=(<input type="text" name="i3" placeholder="i3">&nbsp;,&nbsp;<input
                type="text" name="j3" placeholder="j3">)</div>
        <div class="in">
            <b><i>&beta;</i></b> = <input type="text" name="x" placeholder="x"
                readonly><b><i>&alpha;</i></b><sub>1</sub>+
            <input type="text" name="y" placeholder="y" readonly><b><i>&alpha;</i></b><sub>2</sub>
        </div>
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            <input name="button" type="button" class="bu" id="show" value="演示">
            <input name="button2" type="button" class="bu" id="refurbish" value="刷新">
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